Fresh from a thumping victory over Everton in their last league outing, Arsenal were quickly on the front foot. Mike van der Hoorn blocked Ramsey's goalbound effort before Lukasz Fabianski denied Alexis Sanchez.

Swansea's back five settled relatively well, although Alfie Mawson had to react sharply to prevent Alexandre Lacazette tucking home a Kolasinac cut-back.

Against the run of play, though, it was the visitors who took the lead with their first touch in Arsenal's area as - having latched onto Tammy Abraham's throughball - Clucas kept his composure to prod a fine first-time finish past the onrushing Petr Cech.

Clucas went close to doubling his tally on 40 minutes, Cech left stationary as the midfielder's thumping long-range effort inched past the left-hand upright.

That effort sparked Arsenal into life, however, and former Gunner Fabianski was at his best to keep out Sanchez's stinging strike.

Swansea could have snatched a second on the stroke of half-time when Ayew robbed Per Mertesacker of possession, but Cech was out quickly to smother the danger.

Arsenal were quick to make Swansea pay for that miss six minutes after the restart, Kolasinac hammering home a venomous strike that Fabianksi could only help into the net.

In a whirlwind start to the second half, Abraham thought he had restored Swansea's lead immediately, only for the linesman's offside flag to halt the visitors' celebrations.

Arsenal's turnaround should have been complete moments later, only for Koscielny to head wide of a gaping goal from Sanchez's superb free-kick.

The error did not prove costly, though, as Kolasinac turned a neat pass inside for Ramsey, whose low finish crept in past Fabianksi. The goalkeeper may be disappointed not to have done better.

Wenger's side suddenly looked rampant and Bellerin almost made it a goal apiece for Arsenal's wing-backs when he volleyed Ramsey's cross against the crossbar.

After losing Kolasinac to injury, Arsenal looked to finish with a flourish - substitute Olivier Giroud twice going close - but with Swansea devoid of ideas going forward, those misses mattered little as the Gunners cruised into the Champions League places.

13 - Arsenal have won their last 13 games at the Emirates in all competitions, their longest ever winning run at the stadium. Superstition. pic.twitter.com/3s1MNF86Ih

- This was Arsene Wenger's 400th home win with the Gunners in all competitions (213 Emirates, 185 Highbury, 2 Wembley).- Sead Kolasinac has had a hand in more goals in all competitions for Arsenal this season than any other player (3 goals, 3 assists).- The Gunners have come from behind to win three Premier League games this season, more than they did in the whole of 2016-17 (2).- Swansea have mustered fewer shots (76) and shots on target (20) than any other Premier League side this season.